Tension mechanism for winding-machines.



0. McKEAN. TENSION MECHANISM FOR WINDING MACHINES.

APPLICATION FILED OCT-'9, 1916.

Patented an; 22,1918.

JOHN o. KOREAN, or

was'rrmnn, nassacnosm'rs, assrenoa r ros'rnn maonma ,COMIANY, OF WESTFIELD, MASSACHUSETTS, A CO B POBATION OF MASSACHUSETTS.

TENSION MECHANISM FOR WIlNDING-MLCHINES.

Specmcation of Letters Patent.

. Patented Jan. 22, 1918.

Application filed October 9, 1918. Serial No. 124,439.

To all whom it may concern:

Be it known that 1, JOHN O. MCKEAN, a

citizen of the United States, residing at Westfield, in the county of Hampden and State of Massachusetts, have invented new and useful Improvements in Tension Mechanism for Winding-Machines, of which the following is a specification.

My invention is designed for application to the tension mechanism of winding machines in which the well known sewing machine tension, comprising two opposed disks, mounted for rotation upon an arbor,

is employed.

In the drawings v Figure 1 is an end elevation of a tension device embodying my invention;

Fig. 2 is a front elevation of Fig. .1, lookingrin the direction of the arrow; and

ig. 3 is a detail, partly in section, of the tension disks and. the arbor on which they are mounted. A

In this tension the principal ob'ect is to apply merely such a retarding in uence as will prevent the thread after' it has assed the disks and between the disks and t eeop or bobbin being wound, from having slack. In a sewing machine the passage of thread through the tension disks is intermittent andrelatively slow. In a winding machine the thread travels-constantly and at high speed between the disks.

Under normal conditions the thread passing from the delivery bobbin upward, through the tension device A, to-tlie spool or cop being wound is not retarded by the bobbin, the thread being, drawn otf' delivery over the point of the delivery bo bin,-wh1eh stands vertically beneath the tension device, and the thread, as it enters between the disks A, l5, is slightly diverted from its course by the rotation of the disks, which are slightly separated upon that side through which the thread passes, against the pressure of a light spiral spring, S. Disk A is formed with a hub a, a, part a being squared or of other angular cross section, and disk B is mounted upon the angular portion a, having a suitably shaped aperture, so that disk B must rotate with the hub, but may have longitudinal movement thereon. The hub a, a is mounted .upon an arbor C secured in the outer end of a fixed rod C. A presser memher, I), is also mounted upon the arbor, one

N and embracing the hub a and impinging the thread against upon the disk B, and washer b is interposed between the other end of the presser member and the spring S, the spring S abutting at its other end against a washer d and nut D mounted upon a threaded tube surrounding the rod'C.

As the thread is drawn through the disks, the disks are rotated by the friction of the thread against their opposed faces, and the speed of rotation is normally controlled by the balance established between the frictional urge of the thread upon the face of the disks and the frictional effect of the resser member, I), uponthe back of disk B. he rotation is designed to be relatively slow, owing to the fact that it is impractical to lubricate the bearing surface of the hub a e upon the arbor C owing to the proximity of the thread. .Normally the desired effect is produced, but, due to imperfections in winding of the delivery bobbin there are frequent and innumerable checks in the de-' livery, the immediate effect of which is to increase the draft between the delivery and the winding cop, tending to straighten out the thread. The result is that the thread is drawn relatively hard against the hub-of the tension disk and the slight resistance of the 'presser member b would be overcome and the disks spun at a very high speed were it notthat theslightest increase abovenormal of the draft upon the thread, while it pulls the hub also and at the same instant increases the upward lift on the detector lever E which is supported b the thread and the, pressure ofthe brake against the hub, a, preventing racing of the disks and any possible winding of broken ends in the tension device. In actual 'o eration-the efl'ects described above succee I one another so rapidly that the brake increases and releases pressurelon the hub with an extremely rapid series of actions and the disks under nocircumstanees are raced.

The detector lever E is pivoted at e upon a bracket e fast to the frame of the machine. That bracket also carries a stop e" which limits the upward movement of the detector lever. I haveshown the nut D as mounted upon a threaded sleeve '6' mounted upon ranged to permit the sleeve to'be shifted as.

the cop grows to release tension on the spiral spring S to keep the pressure on the disk B uniform. This latter invention is shown and described in my pending application Serial No. 7 5,802, and will form the subject of-en-. 5 other application.

I claim:

In a tension device, a pair of disks mounted upon a hub for rotation; that hub;

a brake member mounted adjacent to the hub and in operation sustained by the thread 10 in close relation to the hub and pressed against the hub when the draft upon the thread is super-normal;

Signed by me at Boston, Mass, this 6th day of October, 1916.

JOHN O. MoKEAN. 

